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9.3 Properties of Quadrilaterals and the Interior and Exterior
Angles of Quadrilaterals

What are the properties of a quadrilateral? LEARNING
STANDARDS
4 Flip Describe the geometric
properties of various
types of quadrilaterals.
Classroom
Aim: To explore the geometric properties of a quadrilateral. Hence classify
Instruction: • Explore by yourself before the lesson quadrilaterals based on
begins and discuss in groups of four the geometric properties.
during the lesson.
• Open the folder downloaded from page vii.

1. Open the file Quadrilaterals geometric properties.ggb using GeoGebra.

CHAPTER
9
2. Click the checkbox for the first type of quadrilateral. Click and drag the
vertices of the quadrilateral to change the dimensions of the quadrilateral.
Explain the properties of the quadrilateral.
3. Repeat the exploration in Step 2 for all the other types of quadrilaterals.
4. Discuss with your friends the geometric properties of the various types of
quadrilaterals.
5. Open and print the file Quadrilaterals axes of symmetry.pdf. Cut out the
quadrilaterals in the printout.

6. By folding each of the quadrilaterals, or otherwise, explain how you can find
the number of axes of symmetry for each type of quadrilateral.

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Chapter 9

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